Allow disabling memory card writes in netplay.

Fixes issue 6217.

Source/Core/Core/Src/CoreParameter.cpp

@@ -46,7 +46,7 @@ SCoreStartupParameter::SCoreStartupParameter()
   bCPUThread(true), bDSPThread(false), bDSPHLE(true),
   bSkipIdle(true), bNTSC(false), bForceNTSCJ(false),
   bHLE_BS2(true), bEnableCheats(false),
-  bMergeBlocks(false),
+  bMergeBlocks(false), bEnableMemcardSaving(true),
   bDPL2Decoder(false), iLatency(14),
   bRunCompareServer(false), bRunCompareClient(false),
   bMMU(false), bDCBZOFF(false), iTLBHack(0), bVBeam(false),
@@ -81,6 +81,7 @@ void SCoreStartupParameter::LoadDefaults()
 	bSyncGPU = false;
 	bFastDiscSpeed = false;
 	bMergeBlocks = false;
+	bEnableMemcardSaving = true;
 	SelectedLanguage = 0;
 	bWii = false;
 	bDPL2Decoder = false;

Source/Core/Core/Src/CoreParameter.h

@@ -105,6 +105,7 @@ struct SCoreStartupParameter
 	bool bHLE_BS2;
 	bool bEnableCheats;
 	bool bMergeBlocks;
+	bool bEnableMemcardSaving;
 
 	bool bDPL2Decoder;
 	int iLatency;

Source/Core/Core/Src/HW/EXI_DeviceMemoryCard.cpp

@@ -150,6 +150,9 @@ void CEXIMemoryCard::Flush(bool exiting)
 	if(!m_bDirty)
 		return;
 
+	if (!Core::g_CoreStartupParameter.bEnableMemcardSaving)
+		return;
+
 	if (flushThread.joinable())
 	{
 		flushThread.join();

Source/Core/Core/Src/NetPlay.cpp

@@ -271,6 +271,16 @@ bool NetPlay::StopGame()
 	return true;
 }
 
+void NetPlay::SetMemcardWriteEnabled(bool enabled)
+{
+	std::lock_guard<std::recursive_mutex> lkg(m_crit.game);
+
+	if (m_is_running)
+	{
+		Core::g_CoreStartupParameter.bEnableMemcardSaving = enabled;
+	}
+}
+
 // called from ---CPU--- thread
 u8 NetPlay::GetPadNum(u8 numPAD)
 {

Source/Core/Core/Src/NetPlay.h

@@ -111,6 +111,7 @@ public:
 	virtual bool StartGame(const std::string &path);
 	virtual bool StopGame();
 
+	virtual void SetMemcardWriteEnabled(bool enabled);
 	//void PushPadStates(unsigned int count);
 
 	u8 GetPadNum(u8 numPAD);

Source/Core/DolphinWX/Src/NetWindow.cpp

@@ -22,6 +22,7 @@
 #include "NetPlay.h"
 #include "NetWindow.h"
 #include "Frame.h"
+#include "Core.h"
 
 #include <sstream>
 #include <string>
@@ -333,6 +334,9 @@ NetPlayDiag::NetPlayDiag(wxWindow* const parent, const CGameListCtrl* const game
 		padbuf_btn->Bind(wxEVT_COMMAND_BUTTON_CLICKED, &NetPlayDiag::OnPadBuffHelp, this);
 		bottom_szr->Add(padbuf_spin, 0, wxCENTER);
 		bottom_szr->Add(padbuf_btn);
+		m_memcard_write = new wxCheckBox(panel, wxID_ANY, _("Write memcards (GC)"));
+		m_memcard_write->Bind(wxEVT_COMMAND_CHECKBOX_CLICKED, &NetPlayDiag::OnMemcardWriteCheck, this);
+		bottom_szr->Add(m_memcard_write, 0, wxCENTER);
 	}
 
 	bottom_szr->AddStretchSpacer(1);
@@ -397,6 +401,8 @@ void NetPlayDiag::OnStop(wxCommandEvent&)
 void NetPlayDiag::BootGame(const std::string& filename)
 {
 	main_frame->BootGame(filename);
+
+	Core::g_CoreStartupParameter.bEnableMemcardSaving = m_memcard_write->GetValue();
 }
 
 void NetPlayDiag::StopGame()
@@ -449,6 +455,11 @@ void NetPlayDiag::OnPadBuffHelp(wxCommandEvent&)
 	m_chat_text->AppendText(StrToWxStr(ss.str()));
 }
 
+void NetPlayDiag::OnMemcardWriteCheck(wxCommandEvent &event)
+{
+	netplay_ptr->SetMemcardWriteEnabled(m_memcard_write->GetValue());
+}
+
 void NetPlayDiag::OnAdjustBuffer(wxCommandEvent& event)
 {
 	const int val = ((wxSpinCtrl*)event.GetEventObject())->GetValue();

Source/Core/DolphinWX/Src/NetWindow.h

@@ -96,6 +96,7 @@ private:
 	void OnChat(wxCommandEvent& event);
 	void OnQuit(wxCommandEvent& event);
 	void OnPadBuffHelp(wxCommandEvent& event);
+	void OnMemcardWriteCheck(wxCommandEvent& event);
 	void OnThread(wxCommandEvent& event);
 	void OnChangeGame(wxCommandEvent& event);
 	void OnAdjustBuffer(wxCommandEvent& event);
@@ -104,6 +105,7 @@ private:
 	wxListBox*		m_player_lbox;
 	wxTextCtrl*		m_chat_text;
 	wxTextCtrl*		m_chat_msg_text;
+	wxCheckBox*		m_memcard_write;
 
 	std::string		m_selected_game;
 	wxButton*		m_game_btn;